CBS News' Investigative Correspondent Sharyl Attkisson, known during the Obama administration for her work on Solyndra, Benghazi and Operation Fast and Furious, has resigned from her position at the network.

According to POLITICO, the resignation comes as a result of frustration over perceived liberal bias at CBS News.

CBS News investigative correspondent Sharyl Attkisson has reached an agreement to resign from CBS News ahead of contract, bringing an end to months of hard-fought negotiations, sources familiar with her departure told POLITICO on Monday.

Attkisson, who has been with CBS News for two decades, had grown frustrated with what she saw as the network's liberal bias, an outsized influence by the network's corporate partners and a lack of dedication to investigative reporting, several sources said. She increasingly felt like her work was no longer supported and that it was a struggle to get her reporting on air.

At the same time, Attkisson's own reporting on the Obama administration, which some staffers characterized as agenda-driven, had led network executives to doubt the impartiality of her reporting. She is currently at work on a book -- tentatively titled "Stonewalled: One Reporter's Fight for Truth in Obama's Washington" -- which addresses the challenges of reporting critically on the Obama administration.

As noted above, Attkisson has been at CBS for two decades. During her time at the network, she has heavily scrutinized both Democrat and Republican administrations. Back in 2008, Attkisson debunked Hillary Clinton's infamous claim that she dodged sniper fire in Bosnia. During the Bush administration, Attkisson won an Emmy for her reporting on shady Republican fundraising. In 2012, she won an Edward R. Murrow award and an Emmy for her reporting on Operation Fast and Furious. She has been equally critical of both political parties in Washington D.C.

This is an incredible loss for CBS and no doubt another network's gain. Hopefully she'll land at a place where her important work will be aired and promoted.